Using Vertical Turbines to Capture Energy From Passing Vehicles

Enlil was the name of the Mesopotamian god of wind and storms. Now, fittingly, it's what Turkish inventor Gelecegin Yenilenebilir Sehirleri is calling his vertical wind turbine. Interestingly enough, the plan of Sehirleri's company, Deveci Tech, is to line highway medians with them, capturing the wind energy of passing vehicles in order to generate electricity:

Enter a caption (optional)

In litigation-happy America, of course, this thing would have to be wrapped in a safety cage. I wonder if that would decrease its efficacy.

You could probably make a concrete barrier at the bottom that would prevent impact with cars, and have it slanted to channel more air up towards the turbines. As an additional revenue source, you could paint advertisements on the blades. They'd be visible to both sides of the traffic. If no advertisements, there could be important traffic communications like exit number, speed limit, etc.